Gwen Stefani and Blake Shelton relationship has been in the news since quite a few months now. While their relationship has become stronger than ever, Stefani is a bit jealous of Shelton ex-wife's success it seems.

Shelton was married to singer Miranda Lambert before he suffered from a heartbreak and hooked up with Stefani, who has just separated from her husband Gavin Rossdale. Tabloid Celeb Dirty Laundry reports that the "Used to Love You" singer is looking for opportunities to slam Lambert over her songs that talk about heartbreak and divorce.

That is, Stefani hates Lambert for keep singing about her separation and divorce from Shelton. The publication further speculates that the recent success of Lambert's new album may be the reason behind Stefani's frustration. The singer could be jealous of the fame and success that her boyfriend's ex has been able to gain recently.

Lambert did not promote her album "The Weight of These Wings." She even refused to speak publicly and to the media, stating that her album speaks for itself ans that they will get to know what it is about. Despite no promotion. Lambert's album has been topping the charts since weeks now.

On the other hand, Stefani and Shelton relentlessly promoted their albums. Despite all the heavy promotion and efforts, there was only a little success in terms of sales and album popularity.

Stefani may be slamming Lambert for talking about divorce with Shelton, she herself she has not been behaving any different. The singer has constantly been talking about her divorce with Rossdale and how she felt "miserable" in her marriage. In fact, Rossdale himself wishes that Stefani stops talking about her relationship with him in the press.

Meanwhile, Shelton and Stefani were recently spotted taking off for a winter vacation, according to The Inquisitr. The couple, along with Stefani's kids, headed to a vacation to Lake Arrowhead in California.